10001121111220 has 12 divisors (see below), whose sum is σ = 21002354333604. Its totient is φ = 4000448444480.

The previous prime is 10001121111211. The next prime is 10001121111253. The reversal of 10001121111220 is 2211112110001.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1989662586916 + 8011458524304 = 1410554^2 + 2830452^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 10001121111220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250028027761 + ... + 250028027800.

It is an arithmetic number, because the mean of its divisors is an integer number (1750196194467).

Almost surely, 2^{10001121111220} is an apocalyptic number.

10001121111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10001121111220 is an abundant number, since it is smaller than the sum of its proper divisors (11001233222384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10001121111220 is a wasteful number, since it uses less digits than its factorization.

10001121111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500056055570 (or 500056055568 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 10001121111220 its reverse (2211112110001), we get a palindrome (12212233221221).

The spelling of 10001121111220 in words is "ten trillion, one billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twenty".